//exam_2_4_1.c: chang A,B value
#include <stdio.h>

int main(void)
{
    int a = 1;
    int b = 2;
    int tmp;

    printf("a = %d, b = %d\n", a, b);
    tmp = a;
    a = b;
    b = tmp;

    printf("a = %d, b = %d\n", a, b);
    return 0;
}
